Okay @Samuel Hall
Ill take a crack at this. Good job at taking this action step and not being afraid of constructive criticism. it is the fastest way to learn. Also good job doing practice research on houses you know you wont bid on. Its like playing with real stocks with fake money. its a great way to practice.
first for ARV- be careful using just price/sqft for valuations. it is almost ALWAYS more accurate to use comparable property sale prices rather than their price per sqft. and getting a good idea in your head for why their sale prices are higher or lower than the neighborhood average and sort of adjusting in your head for it. make sure that comparable property has less than a 20% up or down variation in square foot, that it is a like style house ( ranch comps for a ranch, two story comps for a two story) , Make sure you are only using above sqft and above sqft as comps when you are looking for properties with similar sqft. if your house is a 2000 sqft ranch you will get a lot more for it than a 1000 sqft house with a 1000 sqft basement. this is very important.
-Repairs are kind of a crapshoot with sight unseen but should be based on sqft not just a random number. usually 20-30 dollars per square foot is more than enough to be safe with. at 30 /sqft it would come close to 40k so if you can still buy it at your 50k mark that's amazing but being high could make you lose a couple deals because you think you can only pay a certain amount.
-Taxes for the year of 2014 for this house were $1417 if we used your calculation of 6 dollars for every 1000 it would be closer to 2200 which is not that far off but usually it is public records what the taxes are for any specific house each year.
-how are you calculating your selling transaction costs. they seem a little low unless you are a realtor and listing yourself. even then you should still expect to pay 3% to a buyers agent. If you are not listing yourself expect to pay 6% unless you can find a realtor to list for you at 2% which is common for investors who give a lot of business to realtors.
That should be enough to get you started with learning more or at least asking different questions. Let me know if you have any more questions. Keep hustling!